Founded 2009 by Serge Michel and Claude Greisler as an independent manufacture on Bözingenstrasse in Biel, building in-house calibers around the brand's openworked 'transparent mechanics' design philosophy and the patented Resonance Clutch Spring that stabilizes twin-balance resonance timekeeping. Grail Atlas catalogs 3 Armin Strom references from Biel/Bienne, Switzerland across 3 collections. Each entry lists market-value bands, production era, brand tier, and what to check before buying.
enthusiastmodernArmin Strom Cal. ARF21 -- manual-wind, in-house, two independent balance/regulator systems connected by the patented Resonance Clutch Spring so they synchronize; 25,200vph, 39j, 276 parts, two independent barrels, 48h PR; twin-seconds flyback resets both running-seconds hands simultaneously without stopping the movement43mm2023–present
enthusiastmodernArmin Strom Cal. ARF22 -- manual-wind, in-house, dual-time GMT resonance movement; two independent regulating systems linked by the patented Resonance Clutch Spring, each driving its own hour/minute/day-night display; 25,200vph, 40j, 231 parts, two independent barrels, 42h PR; hour and minute hands on each side independently adjustable, including to fractional-hour offsets from GMT39mm2025–present
